Underpinnings of fire management for biodiversity conservation in ...

More documents

Recommendations

Info

36 Table 2.3. Some indicative figures 4 for suppression lines (wet or dry) laid down during fire-suppression operations. Wet lines do not involve soil disturbance; dry lines are fuel breaks. Rates of line construction are affected by the experience of the operator. Rates of line construction from the air can be strongly affected by time for refilling and turnaround. Type Wet lines – aircraft Medium Helicopter (1400 litre capacity) Fixed-winged bomber (2500 – 3000 litre capacity) Heavy Helicopter (i.e. Sky Crane) Wet lines – ground tanker Rate of construction (m hr-1 ) Approximate cost per hour (2004 Australian dollars) Fire and adaptive management Underpinnings of fire management for biodiversity conservation in reserves Approximate cost per km (2004 Australian dollars, from previous two columns) f
Underpinnings of fire management for biodiversity conservation in reserves Discussion Table 2.4 is a summary of some of the features of tracks and the categories into which they are placed. The idea is to show that there are many variables in need of consideration (see Figure 2.9 also). Having so many variables makes the task extremely difficult in some areas; simplifications are possible in many circumstances as not all variables apply in every situation. Table 2.4 Track and verge networks (not including wet lines laid down by aircraft or natural edges), their characteristics and their assessment in terms of cost and effect on conservation. TRACKS Property Categories Permanence Temporary, dormant, permanent Width Suited to floats, tankers, light units Lanes One, two or more Passing bays None, present (frequency) Surface Bitumen, gravel, consolidated earth, scraped earth Density See Table 2.1 Drainage works None; spoon drains (S); S and mitre drains (M); M, S and rollovers5 (R); M, S, R and culverts (C ); M, S, R, C and bridges Location Fire perimeter, block perimeter, reserve perimeter Main purpose Fire suppression, travel, visitor access Maintenance VERGES None, ends closed until fire occurs, routine Property Categories Width None, narrow, wide Drainage works See above Treatments Clearance; soil disturbance; slashing/mowing; herbiciding; planting of grasses, shrubs or trees with or without mulch; tree cutting; burning; grazing Maintenance None, rare, routine BLOCKS/NETWORKS created by edges/tracks Property Categories Area Small, large (or ‘area’ given in hectares) Number/density Low, high Shape Square, rectangular, irregular Intersection types Two-way (corner), three-way (e.g. T-intersection), four-way (crossroads) Dead ends ASSESSMENTS None, few, many Measure Categories Dollars Number or high, medium and low Species’ extinction (indigenous spp.) None, a possibility, certain Species’ population (indigenous spp.) Known to be affected by tracks, not affected, not known Habitat effect Hollows of various sorts, habitat complexities of various types (e.g. foliage-height diversity) Cultural relics Fire prone, not fire prone Aesthetics/spiritual quality/ untrammelled nature Sites of significance, others Affect on water yield and it’s quality: amount, chemical composition, suspended solids Within limits, outside limits Weeds and ferals Unaffected, promoted 5 Rollovers are earthen humps across steep sections of track to slow or divert water and to catch sediment. Fire and adaptive management 37
Page 1: Underpinnings of fire management fo
Page 4 and 5: ii Published by the Victorian Gover
Page 6 and 7: iv Chapter 4 Fuel modification by g
Page 8 and 9: Fire and adaptive management vi Pre
Page 10 and 11: Fire and adaptive management viii F
Page 12 and 13: Fire and adaptive management 2 Chap
Page 14 and 15: 4 Objectives and issues What proces
Page 16 and 17: 6 Fire management - especially fire
Page 18 and 19: Underpinnings of fire management fo
Page 20 and 21: 10 Summary Fire management may be s
Page 22 and 23: Fire and adaptive management 12 Cha
Page 24 and 25: 14 For completion, the concept of t
Page 26 and 27: 16 moving organism in the path of t
Page 28 and 29: 18 forest situations2 . Thus whole
Page 30 and 31: 20 Wilson’s work is particularly
Page 34 and 35: 24 Table 2.1 A sample of track dens
Page 36 and 37: 26 The first proposition examined c
Page 38 and 39: 28 Compartmentalised track networks
Page 40 and 41: 30 Sizes and shapes of areas delimi
Page 42 and 43: 32 A track-free or minimal-track re
Page 44 and 45: 34 Researching the effectiveness of
Page 48 and 49: 38 Tracks and fire suppression What
Page 50 and 51: 40 The fire-management concept - wi
Page 54 and 55: 44 Fuel, vegetation and habitat Fue
Page 56 and 57: 46 Fuels for prescribed burning Whe
Page 58 and 59: 48 What is actually achieved in the
Page 60 and 61: 50 Assessing the effectiveness of f
Page 62 and 63: 52 The focus here is on biodiversit
Page 64 and 65: 54 Fire intensity Intensity is the
Page 66 and 67: 56 In a conservation context, the e
Page 70 and 71: 60 Environmental effects of grazing
Page 72 and 73: 62 Indirect effects of grazing Ther
Page 76 and 77: 66 of grazing needs to be determine
Page 78 and 79: 68 grazing locally, leading to a de
Page 80: 70 Fire and adaptive management Und

Underpinnings of fire management for biodiversity conservation in ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?